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Home > PC > Chapter 7 > Lesson 7.2.4 > Problem 7-80

7-80.

Use the general form for a circle to find the radius.
x2 + y2 = r2

Use the form below to find the radius.
(xh)2 + (yk)2 = r2

(x − 7)2 + (y − 5)2 = r2
(3 − 7)2 + (−2 − 5)2 = r2
16 + 49 = r2
65 = r2

(x − 7)2 + (y − 5)2 = 65